* gnu/installer/parted.scm (user-partitions->configuration): Introduce
vertical space and a comment.
* gnu/installer/services.scm (G_): New macro.
(%system-services): Add comment for OpenSSH.
(system-services->configuration): Add vertical space and comments.
* gnu/installer/user.scm (users->configuration): Add comment.
* gnu/installer/steps.scm (format-configuration): Add comment.
(configuration->file): Expound leading comment. Pass #:format-comment
to 'pretty-print-with-comments/splice'.
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